Stamping device



April 10, 1928.

A. J. MAlKs STAMPING DEVCE- Filled Anril 9. 1927 Patented Apr. 10, 1928.,

I 1,665597 P'rEN'r oFFlcE.

ALBERT J' MARKS, OF BOSTON, MASSACHUSETTS, ASSIGNORTO AJAX TIME STAMI' COMPANY, OF BOSTON, MASSACHUSETTS, A COREORATION OF MASSACHUSETTS.

STAMPING DEVVICE.

Application filed April 9, 1927. Serial No. 182,278.

'My present invention relates to stamping devices, and more particularly to an improvement in stamping levices of such a type as is shown in the co-pending case of Joseph Levy, Serial No. 135,583, filed Sept. 15, 1926.

HraOfOz-e in devices of this inna, aaa

culty has been experienccd due to the fact-` that, upon pressing down upon the handle to operate the stamp, the spring thatv rog- ,ula-te's the return action caused a cha'ttering action, oftenfrebounding to such an extent that the `original stamp 'impression' would bo blurred. And in work of this kind, where a clear print is veryessential, blurring, is most objectionable.

This chattering has also tended to loosen g w the mechanism and increase wear, thus inevit-ably' having a weakening effect on all parts of the device.

In my present invention T have endcavored to overcome these objectionable features, and thus have devised an automatic checking, braking, holding, or controlling device which effectually prevents chattering, wear, blurring, or the like.

In carrying out my invention, I have applied a simple, eficient, and` conveniently positioned spring or member, so constructed and arranged as to engage a portion of the moving part of the stamping device, to act as a yielding brake or check, when the handle is released, and the returning spring acts. in the form of a. forked or two-arm spring, shaped and positioned to .straddle and grip or hold the lower part of the .movable or pivoted member carrying certain of the stamping means. This spring acts in opposition to the main spring which both raises and tends to keep the movable portion of the stamping apparatus in raised position, and is so designed as to eliminate completely all chattering effects, and all vibration, preventing any reflex action. My invention also aids in preventing 'wear 'on the mechanism, and acts as a combined braking, holding, and steadying means.

In the accompanying drawing illustrating a preferred embodiment of my invention,

Fig. 1 is a side elevation;

Fig.v 2 is a fragmentary cross sectional View on the line 2-2 of Fig. 1

Referring to the drawings, 10 designates a hollow base having formed integral there- This yielding brake or check may be' with, and at one endjthereof, a pair of spaced ea'rs 11, in which lis. pivotally mounted a carrying arm 12. At the outer o end of said arm 12 is an ordinary 'stamping mechanism enclosed. in'a box-like casing 17, with. a resilient striking pad 18 preferably of rubber surmounted thereon, as av striking handle for theoperator. By strik- Vadjacent its pivot connection with the cars 11, 'is a depending Varm 13, which extends downwardly through a perforation '14 lin the base 10.' Secured to the lower end of the arm 13 is one end of a coil spring 15, thel other end of this spring being connected to a fixed part of the base 10,,as at the lower, end of a lug 16, as clearly shown in the drawing. The spring 15 yieldingly holds the arm 12 in the position shown in Fig. 1, and tends to return saidarm 12, and all parts attached thereto, after a stamping operation, to raised position, as shown inFig. 1. Under the surface of the hollow base 10, and in contact with the lower portion of the arm 13 is a forked two arm spring 20 secured and fulcrumed by the screw 21, the two arms 22 and 23 of said spring 20 straddling the lower converging portion of the arm 13. These arms 22 and 23 are so designed that they not only allow' the arm 13 to be checked by them with a constantly increasing tension and resistance, but they also grip said arm 13 in order to keep it from snapping back from anyrebound no matter how hard the pad 18 may be struck to effectthe stamping operation.

'This spring 20 is thus formed to prevent any chattering or vibrating of the device, thereby saving it from undue wear, or blurring or marring the work.v

'My invention is further defined in the form of claims as follows:

1. A stamping mechanism of the kind described, comprising a base having a recess therein, a stamping member pivotally connected with said base, a portion of said stamping member depending through said` recess, a spring in said base to hold` said stamping member in inoperative position,

and an adjacent supplemental spring engaging` said Vdepending portion of said pivotal member and so arranged as to impart inci'easingresistance to said pivoted member as'the main spring retnrns said'pivoted 1nem-` berfto normal position.

2. A stamplng device of the kind described, comprlsingl a pivoted carrying arrn,

normally raised and to return them to raised position after a stamping operation, and a two-arni spring adapted to straddle the depending armandimpart an increasing brak-` ang :te-nsion and resistance to said dependa i f ing arln and said carrying arm4` as the same areretnrned totnormal position by said contractile` spring.

A stainpingfde'iiice of the kind de-' `s`oribed, onlprising ahollow` base haiing a reeess therethrough adJaeent to one: end

thereof, an upstanding ear at each side of saidrecess, an arrn pivoted to said ears, an arm dependlng froin sald first arin and pro- Jecting through said recess, a depending lng in saidhollow base, atlspring'engaging said lug and said depending arm to `normally hold said first arm in raised position, and a secondspring secnred Etol said base and com- 'pr'ising a pan' of'arms adapted'to straddle and constantly engage said depending ai'm and to im'part a..constant1y increasinggresistance on said depending, armassaid depending arin is returned to normall position by said first spring.

4. ystamping device of the kind delseribed,``co1nprising a hollow base having'a recess: therethroughw adJaoentMto .one end thereof, an u'pstanding ear at each side of said I'ecess, an arin pivoted to`` said`ears, an arni ndepending from said first arrn and projectig through said recess; adepending lu in said hollow base, a 'spring engaging sai lng and said depending arrn-''to normally hold said first arinfin raised1josition, and a second springseciired tojtlieuIderfside of said base and at one side of said'recess and comprising a. pair of `arms,adapted to straddle and constantly engage said depending arni and to iinpart a constantlyiiicreasing resistance on said dependingarm as said depending arIn is returned to normal position by said first spring.` i j V In testimonywhereof, I haye signed my name to this specifioation. o' i ALBERT Jj. MARKS. 

